apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgres
  namespace: storage
spec:
  storageClassName: longhorn-static
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres
  namespace: storage
  labels:
    app: postgres
  annotations:
    reloader.stakater.com/auto: "true"
spec:
  replicas: 1
  revisionHistoryLimit: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: postgres
        image: postgres:latest
        args: ['-c', 'config_file=/etc/postgresql/postgresql.conf', '-c', 'hba_file=/etc/postgresql/pg_hba.conf']
        imagePullPolicy: IfNotPresent
        envFrom:
        - configMapRef:
            name: postgres
        - secretRef:
            name: postgres
        env:
        - name: POD_IP
          valueFrom:
            fieldRef:
              apiVersion: v1
              fieldPath: status.podIP
        volumeMounts:
        - name: postgres-files
          mountPath: /etc/postgresql/postgresql.conf
          subPath: postgresql-master.conf
          readOnly: true
        - name: postgres-files
          mountPath: /etc/postgresql/pg_hba.conf
          subPath: pg_hba.conf
          readOnly: true
        - name: postgres-files
          mountPath: /docker-entrypoint-initdb.d/create-replica-user.sh
          subPath: create-replica-user.sh
          readOnly: true
        - name: postgres-data
          mountPath: /var/lib/postgresql/data
          readOnly: false
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - exec pg_isready --host $POD_IP
          failureThreshold: 6
          initialDelaySeconds: 60
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 5
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - exec pg_isready --host $POD_IP
          failureThreshold: 3
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1
          timeoutSeconds: 3
      volumes:
      - name: postgres-files
        configMap:
          name: postgres-files
      - name: postgres-data
        persistentVolumeClaim:
          claimName: postgres

---

# apiVersion: apps/v1
# kind: StatefulSet
# metadata:
#   name: postgres-replica
#   namespace: storage
#   labels:
#     app: postgres-replica
#   annotations:
#     reloader.stakater.com/auto: "true"
# spec:
#   selector:
#     matchLabels:
#       app: postgres-replica
#   replicas: 1
#   serviceName: postgres-replica
#   updateStrategy:
#     type: RollingUpdate
#   template:
#     metadata:
#       labels:
#         app: postgres-replica
#     spec:
#       terminationGracePeriodSeconds: 10
#       initContainers:
#       - name: setup-replica-data
#         image: postgres:latest
#         imagePullPolicy: IfNotPresent
#         env:
#         - name: PGPASSWORD
#           valueFrom:
#             secretKeyRef:
#               name: postgres
#               key: REPLICATION_PASSWORD
#         command:
#         - sh
#         - -c
#         - |
#           if [ -z "$(ls -A /var/lib/postgresql/data/pgdata)" ]; then
#               echo "Running pg_basebackup to catch up replication server...";
#               pg_basebackup -R -h postgres -D /var/lib/postgresql/data/pgdata -P -U replication; 
#               chown -R postgres:postgres $PGDATA;
#           else
#               echo "Skipping pg_basebackup because directory is not empty"; 
#           fi
#         volumeMounts:
#         - name: postgres-replica-data
#           mountPath: /etc/postgresql/data
#           readOnly: false
#       containers:
#       - name: postgres-replica
#         image: postgres:latest
#         args: ['-c', 'config_file=/etc/postgresql/postgresql.conf']
#         imagePullPolicy: IfNotPresent
#         envFrom:
#         - configMapRef:
#             name: postgres
#         - secretRef:
#             name: postgres
#         env:
#         - name: POD_IP
#           valueFrom:
#             fieldRef:
#               apiVersion: v1
#               fieldPath: status.podIP
#         volumeMounts:
#         - name: postgres-files
#           mountPath: /etc/postgresql/postgresql.conf
#           subPath: postgresql-replica.conf
#           readOnly: true
#         - name: postgres-replica-data
#           mountPath: /var/lib/postgresql/data
#           readOnly: false
#         livenessProbe:
#           exec:
#             command:
#             - sh
#             - -c
#             - exec pg_isready --host $POD_IP
#           failureThreshold: 6
#           initialDelaySeconds: 60
#           periodSeconds: 10
#           successThreshold: 1
#           timeoutSeconds: 5
#         readinessProbe:
#           exec:
#             command:
#             - sh
#             - -c
#             - exec pg_isready --host $POD_IP
#           failureThreshold: 3
#           initialDelaySeconds: 5
#           periodSeconds: 5
#           successThreshold: 1
#           timeoutSeconds: 3
#       volumes:
#       - name: postgres-files
#         configMap:
#           name: postgres-files
#   volumeClaimTemplates:
#   - metadata:
#       name: postgres-replica-data
#       namespace: storage
#     spec:
#       storageClassName: longhorn-static
#       accessModes:
#         - ReadWriteOnce
#       resources:
#         requests:
#           storage: 1Gi

---

apiVersion: v1
kind: Service
metadata:
  name: postgres
  namespace: storage
spec:
  type: LoadBalancer
  externalTrafficPolicy: Cluster
  selector:
    app: postgres
  ports:
  - name: db
    port: 5432
    protocol: TCP

---

# apiVersion: v1
# kind: Service
# metadata:
#   name: postgres-replica
#   namespace: storage
# spec:
#   type: LoadBalancer
#   externalTrafficPolicy: Cluster
#   selector:
#     app: postgres-replica
#   ports:
#   - name: db
#     port: 5432
#     protocol: TCP